My workaround for no Break/Fill is to have the Variation selection on the FC-7, along with the Break. So, you go 'Press Break' on the 'one', count a beat or two, then press the next Variation you want, the fill comes in halfway through, and the next Variation comes up. Simple.
I'd recommend putting the Break on switch 7, well away from the Variation 1-4 at the other end of the FC-7, to stop you accidently hitting it, other than that, it has the advantage over just ONE Break/Fill that you now have SIX (depending on where you are going to, and coming from).
No, it's not perfect, but it's not as hard as some make out.
Personally, if I were you and things like the two button system for Endings bugs you (mind you, the two simultaneous button system for the Chord Sequencer on Korg's drives e equally crazy!), I'd look into a very small, very cheap MIDI button bank, and program the specific Endings to four of the buttons.
But overall, if you can handle having to hit two buttons to do ONE thing on the Korg, you can probably learn to do it on a Roland!
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An arranger is just a tool. What matters is what you build with it..!